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1. AcetylcholineA chemical found in vertebrate neurons that carries information across the synaptic cleft, the space between two nerve cells.

2. AcetylcholineA chemical released at neuromuscular junctions that binds to receptors on the surface of the plasma membrane of muscle cells, causing an electrical impulse to be transmitted. The impulse ultimately leads to muscle contraction.

3. AcetylcholinesteraseAn enzyme that breaks down unused acetylcholine in the synaptic cleft (the space between neurons); this enzyme is necessary to restore the synaptic cleft so it is ready to transmit the next nerve impulse.